Orienting apparatus



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asrassi ?atented elan. 22, i953 assigner to Woninglittsburgh, Pa, a cor- The p-esent invention relates to the manufacture of fluorescent lamps and, more particularly, to apparatus for orienting the lead wires of a fluorescent lamp preparatory for a lead-wire straightening operation and a subsequent base-threading operation.

Herctoiore, when a vertical-type threadinx7 machine (of type shown in US. latent No. 2,729,690, issued Ociullan et al.) was employed, it was toccr i8, 1955 to l. not necessary to orient the lead wires or" a fluorescent lamp prior to the straightening of the lead wires, because the associated eidoaust machine, transfer device and threading machine were all driven by an integrated synchronized After the lead wires were oriented on the exhaust machine, such lead wires remained in the oriented position throughout the transfer and subsequent threa ling operations.

-lowever, in order to increase the production rate oi the Mullen et al. machine (from i260 threaded lamps per hour) to a production rate of 363'() threaded lamps per hour, a horizontal-type threading machine is currently employed. T s horizontal-type threading machine receives tne fluorescent lamps from an inclined loading platform t the lead wires at both ends or" such lamps aligned relative to each other but randomly disposed at var ous angles with respect to a desired reference plane in which such lead wires must be positioned to properly straighten such lead wires and to then thread a base onto the straightened lead wires.

lt is the general o ject of the present invention to avoid and overcome the foregoing and oher difficulties of and objections to prior-art practices by the provision oi leadwire orienting anp; atus for a threading machine, which orion-ting appar" in a desired reference plane preparatory for a lead-wire straightening operation, while such threading machine is operating at a high production rate.

The a'roresaid object of the present invention, and other objects which will become apparent as the description proceeds, are achieved by providing orion-ting apparatus comprising detecting means adjacent the lead wires onone end or" a fluorescent lamp, lamp-rotating means for rotatingthe lamp and for moving the lead wir-es from the random plane in which they are usually disposed to a desired reference plane, a light source for producing a beam or" light, light-responsive means aligned with thek light source for receiving the beam of light, and lightshielding means connected to the detecting means and movable therewith from a light-shielding position to a light-transmitting position, The shielding means is normally disposed in the light-shielding position between the light source and the light-responsive means to interrupt the beam of light from the light source to the light-responsive means. The detecting means and the shielding means are movable by one or" the adjacent lead wires during movement of the latter from the random plane to the reference plane to position the shielding means in the light-transmitting position when the lead wires are dispose substantially in the reference plane, thereby permitting actuation of the light-responsive means by the earn of light. lnterrupting means, operatively associated with the lamp-rota ng means and the light-responsive means, are then responsive to actuation of the light-responsive means to stop the lamp-rotating means and ros will efficiently orient the lead wires 2 tation of the lamp and the lead wires when the lead wires are disposed substantially in the reference plane.

For a better understanding of the present invention reference should be had to the accompanying drawings, wherein like numerals of reference indicate similar parts throughout the several views and wherein:

FlG. l is a diagrammatic side-elevational View of a horizontal-type threading machine incorporating the leadwire orienting apparatus of the present invention;

FIG. 2 is an end View of a `iluorescent lamp showing the random (dotted-line) position in which the lead wires r" the fluorescent lamp are presented to the orienting apparatus and further showing the nal (solid-line) oriented position of such lead wires;

FlG. 3 is a fragmentary side-elevational View of the `fluorescent lamp showing the nal oriented position of the lead wires;

FlG. 4 is a view similar to FlG. 3 taken at Station 7, a wire-straightening station of the threading machine, and showing the straightened lead wires;

EEG. 5 is a View similar/to lllGS. 3 and 4, illustrating the threading or a base onto the straightened lead wires at Station 9, a base-threading station of the threading machine;

FlG. 6 is a fragmentary Vertical-sectional View along the line Vil-Jl of FIG. 15 in the direction or" the arrows and showing the details of the endless chains and heads adjacent Stations 4U7 oi the threading machine;

FIG 7 is a fragmentary plan View along the line Vllot 1llill. 6 in the direction of the arrows;

G is a vertical-sectional View along the line VIH- fill of rlG. 1 in the direction of the yarrows of the left side of the threading machine and the detecting mechanism at Station 5, the lead-wire orienting station, after the l lead wires have been oriented;

FlG. 9 is an enlarged vertical-sectional View along the line lX-lX oi FlG. 8 in the direction of the arrows;

FlG. 10 is a View similar to FlG. 9 along the line X-X of FIG. 8 in the direction of the arrows;

EGS. ll--lff1 are diagrammatic side-elevational views illustrating the operation of the lamp-rotating mechanism and the associated interrupting means;

FlG. 15 is a View similar to CHG. 8 along the line XV- XV of l in the direction of the arrows, constituting a continuation of such FlG. E and showing the right side or" the threading machine at Station 5, the lead-wire orienting station, the lamp-rotating mechanism, interrupting means and associated mechanisms;

FIG. 16 is a vertical-sectional View along the line X`Vl-Xll of FlG. 15 in the direction of the arrows;

El@ l7 is a diagrammatic view illustrating the operating sequence of the components or the orienting apparatus with respect to the indexing of the threading machine;

FlG.' 13 is a diagrammatic perspective View of the orienting apparatus at the start of the orienting operation.

Although the orienting apparatus or" the present invention is operable to orient lead wires or discharge and incandescent lamps in general, the apparatus of the present invention is particularly adapted for orienting the lead wires of a iluorescent lamp preparatory for a lead-wire straightening operation, and hence'it has been so illustrated and will be so described.

With speciic reference to the forni of the present invention illustrated in the drawings, and referring particularly to HG. l, a base-threading machine is indicated generally by the reference numeral lil.

rEhis base-threading machine l@ (FIG. l) has a pair of endless chains l2 disposed substantially parallel to each other in a horizontal plane and supported by sprockets ldwhich are mounted on each end of shafts 15. Such endless chains lZ are provided with a plurality of transversely registering heads 16 for receiving and supporting exhausted iiuorescent lamps 18. The registering heads 16 are indexed through a number of stations by a conventional indexing mechanism (not shown, but which may be of the. type disclosed in U.S. Patent No. 2,569,852 issued October 2, 1951 to I. H. Green) at an index rate operable to provide 360i) threaded lamps 18 per hour. These endless chains 12 ride on (and are supported by) support tracks 20 (FIGS. 6, 7, 8 and 15) affixed to a frame 22 of the threading machine 10 along the upper horizontal path of movement of the endless chains 12 adjacent Stations 4-l9.

H ends As shown in FIGS. 7, 8 and l5, each of the heads 16 comprises a mounting bracket 24 aflixed to the endless chain 12, a xed jaw 26 secured to the mounting bracket 24 and a movable jaw 28 pivoted at Btl on the mounting bracket 24 and biased by a spring 32 toward such xed jaw 26.

At Station A (rFIG. 1)v auorescent lamp 18 rolls down a gravity-type loading platform (not shown) into Y a pair of registering open heads 16. The movable jaws 28 are closed about the ends of the supported fluorescent lamp 18 by cam means (not shown) at Station 3 and thereafter the secured uorescent lamp 18 is indexed to Station 4. Adjacent Station 4 and Station 5, the lead-wire orienting station, apin 34 (FIGS. 6, 7, 8 and 15) projecting from each oppositely disposed mounting bracket 24 engages a hold-down cam 36 on the frame 22, which hold-down cam 36 seats the associated head 16 on the adjacent support track 20 and opposes any rocking movement of the head 116 during opening of the movable jaws 28 between Stations 4 and 5.

Between Stations 4 and 5 (FIGS. 6 and 7) and after engagement of the pins 34 with the cams 36, a roller 38 oneach oppositely disposed movable jaws 28 engages a stationary jaw-operating cam 4t? thus opening each movable jaw 28 and releasing the uorescent lamp 18 for the lead-Wire orienting operation which is performed by the lead-Wire orienting apparatus of the. present invention.

This lead-wire orienting apparatus comprises essentially a lead-Wire detecting mechanism (FIGS. 8-10) and a lampi-rotating mechanism (FIGS. 11-16).

Detecting Mechanism As shown in FIG. 8, lead wires 42. projecting from the end of the now-released fluorescent lamp 18 adjacent the detecting mechanism may be disposed substantially in one plane, indicated by the dotted-line position of FIG. 2.

Since the lead wires 42 (on the end of the uorescent lamp 18 adjacent such detecting mechanism) are in the same plane as the lead Wires 42 on the opposite end of the fluorescent lamp 18 (FIG. 15), orientation or movement of the lead Wires 42 shown in FIG. 8 toV a reference plane, the desired solid-line position shown in FIG. 2, Will'automatically orient the lead Wires 42 on the other end of the lamp 18 and shown in FIG. 15.

As shown in FIG. 8, the detecting mechanism (FIGS. 8-10 and 18) has a rod 44 pivoted on the frictionless bearings 46 carried by a slide 48 reciprocable in the frame 22. Such pivotable rod 44 carries a detecting means, such as a detector 50 (which is disposed, when in the solid-line position of FIG. 8, in the path of rotatable movement of the lead Wires 42) and a light-shielding means, such as a shield 52 which is disposed Vbetween a light source 54, and a focusing shield 56. This shield 56 is mounted on the frame 22. Also mounted on the frame 22 to the left ofthe focusing shield 56 (FIG. 8) is a light-responsive photoelectric cell 58; Y

As shown in FIG. 17, near the end of the indexing movement of the heads 16 and the fluorescent lamp 18 carried thereby into Station 5, the lead-wire orienting and the lamp 18 are then rotated continuously in clockwise direction (FIG. 18) and counter clockwise direction (FIGS. l0 and 12) by the lamp-rotating mechanism (FIGS. 11-14, l5 and 16) as hereinafter described in detail.

This detector-reciprocating mechanism (FIG. 8) comprises a lever 68 pivoted at 62 and driven by a cam 64 on a cam shaft 66 (FIG. 8), which cam shaft 66 is continuously rotated by a continuous drive means 68.

While the shield S2 is in the dotted-line position ofV FIG. 8, magnets 7@ on the frame 22 position the shield 52 in a vertical position similar to its' dotted-line position shown in FIG. 9. Y As a result the detector 5d (dottedline position, FIG. 10') is aligned in a vertical position thus assuring presentment of the detector Sti into the rotational path of movement of the lead Wires 42 parallel to the vertical centerline G-G (FIG. l0) of the. lamp 18 and spaced a distance d therefrom.

The initial presented position of the detector 50 (dottedline position, FIG. 1G) is offset this distance d from .the vertical centerline G-G (FIG. l0) of the lamp 1S, so that when the lead Wires 42 are in the final oriented position shown in FIG. l0, the detector 50 and hence the shield 52 (FIG. 9) Will have been rotated clockwise through an angle u With the result that light from the light source S4 then passes beyond the shield 52, through the focusing shield 56 and into the photo-electric. cell 58 disposed in a photocell circuit.

As shown in B1G. 18, an associated amplifier '72 in this photocell circuitl is connected to a suitable voltage supply (indicated by the legend A.C. voltage supply). The signal (produced by theincidence of light from the light source 54 on the cell 58) is fed into the amplifier 72 and the ampliiied signal is fed from the output side of the amplifier 72. to a relay '74. This relay 74 has a normally-closed contact 76 disposed in a solenoid circuit.

'This solenoi circuit comprises a line 78 extending from one side of the A.C. voltage supply through the` normally-closed contact 76 to one side of a coil of a Solenoid 80 and a conductor 82 connecting the other iside of the coil of the solenoid 30 through a cam-operated resetting switch 84 -to the other side of the A.C. voltage supply.

In summarizing the operation of the detecting mechanism, Aiirst the detector S0 and the shield 52 are vertically aligned by the magnets 70 and the detector '50 is moved into the path of movement of the lead wires 42 (FIG. 1,0) Thereafter the lamp-rotating mechanism begins to rotate the lamp 18 and the lead wires `42 attached thereto so that one `of the lead Wires `42. engages and rotates the ldetector 50 (and the shield -52 attached thereto) through an angle a lby the time such lead wires 42 reach theY tinal oriented positions l(FIGS. l0 and 13). Incident light from the light source 54 -is admitted Iby the rotated shield 52 through the focusing shield 56 -and strikes the photoelectric cellV 58 which feeds an input signal Yinto the energized amplifier 72. The yampliiied output ,signal fromthe amplifier '72 de-energizes the relay 7 4 with resultant opening of the normally-closed contacts 76 in the` solenoid circuit and attendant deenergization of the solenoid 80. As a result a pawl 86 carried by an armature 88 of the solenoid 480 is released and drops (by its own weight) downwardly-(as limited by a stop 87, FIGS. 11-14, 16) into engagement with a ratchet wheel 90 of the lamprotating mechanism thereby yinterrupting the rotation of the lamp 18 and stopping the lead Wires 42 on both ends ofthe lamp 18 in the desired oriented position (FIGS. 2 and 10).

ln order to rotate the fluorescent lamp 18 (FIG. 15), the lamp-rotating mechanism has a pair of guide rollers 94 and a drive roller 92 which are moved into engagement with the fluorescent lamp 1S by -a first and second reciprocating means respectively, while the detector 5h (Elf. 17) is moving into the rotational path of movement of the lead Wires 42.

tirst reciprocating means for the guide rollers 94 comprises a lever 9x5 (which carries the guide rollers 94 and is pivoted at 93), a connecting rod 1% (provided with guide means 1412) and a cam 1%4 on a cam shaft e6' driven by continuous drive means 63. In order to properly seat the guide rollers 94- on the lamp 18, the lever E6 carries ya locator 106 which is insertable into a cooperating locating slot ll (FGS. 5 and 15) on the fixed jaw Zo ofthe head 16 at Station 5.

To provide vertically reciprocable mounting for the drive roller such second reciprocating mechanism for the drive roller 92 is provided with a casting 119 (FG. which is vertically reciprocable in a guide 112 in the frame 22 by means of la cam 114 on the cam shaft 65. The drive roller 72 is mounted on a shaft 115 which is rotatable in the casting 11d.

"ih-e drive means (FIGS. 15 and 16) utilized to rotate the shaft 11S and the drive roller 92 comprises a chain drive 116 connected by a lower` sprocket 117 to the continuously rotating cam shaft 66. This chain drive 116 is connected to the shaft 115 by a friction clutch 118 which is disposed between a top sprocket 117 of the chain drive and a hub of the above-mentioned ratchet Wheel rlhis ratchet wheel 9@ is, or" course, afllxed t0 the shaft 115 and has its toothed portions aligned with the pawl 86 utilized to arrest the rotational movement of the ratchet wheel gli, the shaft 115 (secured to the ratchet Wheel Eid) and the drive roller 92 (carried by the shaft 115). As a result the lamp 1? ceases to rotate when the lead Wires 42. arrive `at the desired oriented position (FIGS. Z and 1G) and the pavvl d6 arrests the ratchet wheel 9@ (EEG. 13). The still rotating part of the friction clutch 113 (FlG. 15) thereafter rotates on the hub of the now-stationary ratchet Wheel 9i?.

While the detector Sil (HG. 17) is moving toward the lead Wires d2, the irst reciprocating mechanism for the guide rollers 94 moves the guide rollers 94 downwardly tov/ard the lamp 18 and simultaneously therewith the second reciprocating mechanism moves the drive roller B12 upwardly tov/ard the lamp 18.

At the time indicated by the centerline nin FIG. 17 the guide rollers 95:, drive roller $2, and detector Si? are in the position shown in FIG. 11. Since the pawl 86 is not in engagement with the ratchet Wheel tl, the drive roller 92 is rotating continuously in clockwise direction (Fl-G. 1l).

When a point (indicated by the centerline C-`C in FIG. 17) in the operating cycle of the orienting apparatus is reached, the drive roller 92 (FIG. 12) will have completed its upward movement through a distance h (FIGS. 12-14, 15, 16); the lamp 18 is then secured between the continuously rotating rive roller 92 and the guide rollers and the lead Wires 42 will have been rotated clockwise from the position shown in FlG. 11 to the position shown in HG. l2, where one of such lead wires 42 is about to engage the detector Si).

At the time indicated by the centerline D-D in FG. 17, the detector Sil has een rotated by one of the engaging lead wires i2 through the angle a; the lead wires 42 are then in the desired nal oriented position (FlGS. 2 and 10); the solenoid Sti has been deenergized and the pawl 56 has engaged the ratchet Wheel 9%; and rotation of the drive roller 9d, lamp 18 engaged thereby and the finally oriented lead wires 42 has been interrupted.

Thereafter, as indicated in FG. 17 and shown in FIG. 14 and preparatory for indexing of the head 15 and lamp 1S `from Station 5 to Station 6, the detector Sil and shield S2 are retracted to the dotted-line position shown in HG. 8, Where the magnets 7i? (FIGS. 8-10) guarantee that the `shield '52 and detector Si) connected thereto have returned to the starting vertical position, thereby again interrupting the path of incident light (from the livht source 54) to the photo-electric cell 58 with resultant deenergization of the relay 74 (FIG. 18) and closure of the normally-closed contact 76. Simultaneously therewith the now stationary drive roller 92 and guide rollers 94 are retracted to the position shown in FIG. 14. HOW- ever, to prevent energization of the solenoid Sil and resultant rotation of the drive roller 92 during the indexing of the head 16 and the lamp 18 carried thereby from Station 5 to Station 6, the microswitch Se is opened by a cam 122 (FlG. l5) on the cam shaft 66 before such indexing movement begins.

At the time indicated by the centerline l-JE. in FiG. 17 the abovevdescribed elements of the orienting apparatus will have reached the positions shown in FIG. 14 While the lamp 1S is being indexed from Station 5 to Station 6. As shown in FlG. 17, the microswitch S4 is closed by the cam 122 just lbefore the index of the head 16 is completed.

Thereafter, as indicated in FlG. l, the oriented lead Wires 42 on the lett end of the lamp 18 (as viewed in FlG. 8) are straightened at Station 7 to the position shown in FlG. 4. At Station 9 a oase 124 (FlG. 5) is threaded over the straightened lead Wires 42. At Stations 10 and 12, the Wire-straightening and basethreading operations are repeated with respect t the oriented lead wires l2 on the right side (FiG. 15 of the lamp 18. The lamp 1.8 with the bases 12d threaded over the lead Wires 42 is unloaded from the threading ma chine at Station 27.

lt will be appreciated that alternatively the required relative movement between the detector Sii and the lead wires l2 may be obtained by maintaining the detector 50' and shield 5.?. (mounted by means or the rod 44 on the slide d8) stationary and by providing a mechanism similar to the above-described detector reciprocating mechanism (FlG. 8) for moving the lamp 1S and the randomly disposed lead wires l2 on the right side of the lamp 1S, as viewed in FG. 8, into the path of movement of the detector Sti.

It will be recognized by those skilled in the art that the objects of the present invention have been achieved by providing a threading machine of the horizontal type with an orienting apparatus that will eliiciently orient the randomly disposed lead Wires projecting from a fluorescent lamp in a desired position, preparatory for a subsequent lead-Wire straightening operation while such threading machine is operating at a high production rate in the neighborhood of about 3660 threaded lamps per hour.

While in accordance with the patent statutes a preferred embodiment of the present invention has been illustrated and described in detail, it is to be particularly understood that the invention is not limited thereto or thereby.

l claim:

1. Lead-in wire orienting apparatus for a base-threading machine having a head for supporting a partially fabricated fluorescent lamp, electrical lead-in Wires extending from opposite ends or said lamp, a longitudinal section of each of said lead-in wires disposed substantially in one plane passing through the longitudinal axis of said lamp, a reference plane passing through the longitudinal axis of said lamp, and a longitudinal section of each of said lead-in wires desired to be positioned substantially in said reference plane by said apparatus, said apparatus comprising, lamp-rotating means for rotating said lamp and said lead-in wires about the longitudinal axis of said lamp, rotatable Wire-detecting means disposed when in operative position in the path of rotational moveaofrafss'l ment of said lead-in Wires and adapted Vto'becontacted by and rotated by one ofisaid lead-in wires, a light source for producing a directed beam of light, light-detecting means for receiving the beam of light emanated by said light source, light-shielding means .connecting to said wireldetecting means and rotatable thereby and therewith, said'light-shielding'means when not rotated by said Wire-detecting means disposed in light-shielding position between said light source and said light-detecting means, one of said lead-in wires when substantially longitudinally intersected by said reference plane acting to contact Yand rotate said wire-detecting means and to rotate-said lightshielding means to permit the beam of light from said light source to strike said light-detecting means, and interrupting means actuated by said light-detectingmeans to stop rotation of said lamp and said lead-in wires by said lamp-rotating means when the beam of light from saidrlight source strikes said light-detecting means.

2. Lead-in wire orienting apparatus for a base-threading machine having a head for supporting a partially fabricated fluorescent lamp, electrical lead-in Wires extending from opposite ends of said lamp, a longitudinal section of each ofsaid lead-in wires disposed substantially in one plane passing through the longitudinal axis of said lamp, a reference plane passing through the longitudinal axis of said lamp, Vand a longitudinal section of each of said lead-in Wires desired to be positioned ysubstantially in said reference plane by said apparatus, said apparatus comprising, ylamp-'rotating means for rotating said lamp and said lead-in Wires about the longitudinal axis of said lamp, rotatable Wire-detecting means adapted to be moved into operative position disposed in thepath of r0- tational movement of said lead-in wires and adapted to be contacted'by and rotated by one of said lead-in wires, a light source for producing a directed beam of light, light-detecting means for receiving the beam of light emanated by said light source, light-shielding means connecting to said Wire-detecting means and rotatable thereby and therewith, said light-shielding means when not Arotated byV said wire-detecting means disposed in lightshielding position between said `light source and said light-detecting means, one of said lead-in Wires when substantially .longitudinally intersected by said reference plane acting to contact and vrotate said Wire-detecting means and to rotate said light-shielding means to permit the beam of light vfrom Ysaid light source to strike said light-,detecting means, and interrupting means actuated by said light-detecting means to stop rotation of said lamp and said lead-in wires by said lamp-rotating means when the beam of light from said light source strikes said light-detecting means.

3, The apparatus as specified in claim 2, wherein said electrical lead-in wires comprise a pair of electrical lead- Y in Wires extending from each end of said lamp.

2i. The apparatus as specified in claim 2, wherein a slidable support carries said wire-detecting means, additional drive means acts to move said slidable support and said` wiredetecting means into operativeV position disposed inthe path of rotational movement of said Vlead-in wires, and ,synchronizing means causes said support to move said wire-detecting means into operative .position References Cited in the le of this patent UNITED STATES PATENTS Reynolds July 13,1954 Hait Sept. 23, 1958 

1. LEAD-IN WIRE ORIENTING APPARATUS FOR A BASE-THREADING MACHINE HAVING A HEAD FOR SUPPORTING A PARTIALLY FABRICATED FLUORESCENT LAMP, ELECTRICAL LEAD-IN WIRES EXTENDING FROM OPPOSITE ENDS OF SAID LAMP, A LONGITUDINAL SECTION OF EACH OF SAID LEAD-IN WIRES DISPOSED SUBSTANTIALLY IN ONE PLANE PASSING THROUGH THE LONGITUDINAL AXIS OF SAID LAMP, A REFERENCE PLANE PASSING THROUGH THE LONGITUDINAL AXIS OF SAID LAMP, AND A LONGITUDINAL SECTION OF EACH OF SAID LEAD-IN WIRES DESIRED TO BE POSITIONED SUBSTANTIALLY IN SAID REFERENCE PLANE BY SAID APPARATUS, SAID APPARATUS COMPRISING, LAMP-ROTATING MEANS FOR ROTATING SAID LAMP AND SAID LEAD-IN WIRES ABOUT THE LONGITUDINAL AXIS OF SAID LAMP, ROTATABLE WIRE-DETECTING MEANS DISPOSED WHEN IN OPERATIVE POSITION IN THE PATH OF ROTATIONAL MOVEMENT OF SAID LEAD-IN WIRES AND ADAPTED TO BE CONTACTED BY AND ROTATED BY ONE OF SAID LEAD-IN WIRES, A LIGHT SOURCE FOR PRODUCING A DIRECTED BEAM OF LIGHT, LIGHT-DETECTING MEANS FOR RECEIVING THE BEAM OF LIGHT EMANATED BY SAID LIGHT SOURCE, LIGHT-SHIELDING MEANS CONNECTING TO SAID WIRE-DETECTING MEANS AND ROTATABLE THEREBY AND THEREWITH, SAID LIGHT-SHIELDING MEANS WHEN NOT ROTATED BY SAID WIRE-DETECTING MEANS DISPOSED IN LIGHT-SHIELDING POSITION BETWEEN SAID LIGHT SOURCE AND SAID LIGHT-DETECTING MEANS, ONE OF SAID LEAD-IN WIRES WHEN SUBSTANTIALLY LONGITUDINALLY INTERSECTED BY SAID REFERENCE PLANE ACTING TO CONTACT AND ROTATE SAID WIRE-DETECTING MEANS AND TO ROTATE SAID LIGHTSHIELDING MEANS TO PERMIT THE BEAM OF LIGHT FROM SAID LIGHT SOURCE TO STRIKE SAID LIGHT-DETECTING MEANS, AND INTERRUPTING MEANS ACTUATED BY SAID LIGHT-DETECTING MEANS TO STOP ROTATION OF SAID LAMP AND SAID LEAD-IN WIRES BY SAID LAMP-ROTATING MEANS WHEN THE BEAM OF LIGHT FROM SAID LIGHT SOURCE STRIKES SAID LIGHT-DETECTING MEANS. 